Convert the PluginResource to be refcounted.

ppapi/proxy/ppb_graphics_3d_proxy.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ppapi/proxy/ppb_graphics_3d_proxy.h"
 
 #include "gpu/command_buffer/client/gles2_implementation.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/proxy/enter_proxy.h"
 #include "ppapi/proxy/plugin_dispatcher.h"
@@ skipping 430 matching lines @@
     }
   }
   attribs.push_back(PP_GRAPHICS3DATTRIB_NONE);
 
   HostResource result;
   dispatcher->Send(new PpapiHostMsg_PPBGraphics3D_Create(
       INTERFACE_ID_PPB_GRAPHICS_3D, instance, config, attribs, &result));
   if (result.is_null())
     return 0;
 
-  linked_ptr<Graphics3D> graphics_3d(new Graphics3D(result));
+  scoped_refptr<Graphics3D> graphics_3d(new Graphics3D(result));
   if (!graphics_3d->Init())
     return 0;
 
   return PluginResourceTracker::GetInstance()->AddResource(graphics_3d);
 }
 
 bool PPB_Graphics3D_Proxy::OnMessageReceived(const IPC::Message& msg) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(PPB_Graphics3D_Proxy, msg)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBGraphics3D_Create,
@@ skipping 142 matching lines @@
 void PPB_Graphics3D_Proxy::SendSwapBuffersACKToPlugin(
     int32_t result,
     const HostResource& context) {
   dispatcher()->Send(new PpapiMsg_PPBGraphics3D_SwapBuffersACK(
       INTERFACE_ID_PPB_GRAPHICS_3D, context, result));
 }
 
 }  // namespace proxy
 }  // namespace pp